Im wondering where I could get a decent tune for my 04' ford focus zx3 hatch.. and if i go to a local place if they're smart enough to know what to do
to fix the problem.
Im having a check engine light come on and was told it was due to my header,off-road pipe and catback exhaust conversion.

you should get into contact with Tom. his screen name on this site is 1turbofocus. it sounds like you might have a check engine light for the rear o2 sensor since you probably dont have a cat in between the front and rear o2's anymore. you can order a xcal 3 flasher device and a tune from tom right now for 470 bucks if i rememer correctly. this is a really good deal for the hardware AND tune and on top of that he offers free tune updates whenever you add some new goodies to your car so long as you stay N/A. nobody else that i know of will do that. focus sport charges 100 bucks for an updated tune.
link to his thread SCT XCAL W/ Dashscan Special $469.00

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